<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/Home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 头部警告区 -->
        <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>

        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader
                    v-model="selectedCateKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange">
                </el-cascader>
            </el-col>
        </el-row>

        <!-- tab页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type='expand'>
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index,scope.row)">{{item}}</el-tag>
                            <!-- 输入的文本框 -->
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type='index' label="#"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                <!-- 静态参数表格 -->
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type='expand'>
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index,scope.row)">{{item}}</el-tag>
                            <!-- 输入的文本框 -->
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column> 
                    <!-- 索引列 -->
                    <el-table-column type='index' label="#"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
    data(){
        return{
            /* 商品分类列表 */
            catelist:[],
            /* 级联选择框的配置对象 */
            cateProps:{ 
                value:'cat_id',
                label:'cat_name',
                children:'children',
                expandTrigger: 'hover' 
            },
            /* 级联选择框双向绑定到的数组 */
            selectedCateKeys:[],
            /* 被激活的页签的名称 */
            activeName:'many',
            /* 动态参数数据 */
            manyTableData:[],
            /* 静态属性数据 */
            onlyTableData:[],
            /* 控制添加对话框的显示隐藏 */
            addDialogVisible:false,
            /* 添加参数的表单数据对象 */
            addForm:{
                attr_name:''
            },
            /* 添加表单的验证规则对象 */
            addFormRules:{
                attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            editDialogVisible:false,
            editForm:{},
            editFormRules:{
                attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status!==200)
                return this.$message.error('获取商品分类失败！')
            
            this.catelist=res.data

            console.log(this.catelist)
        },
        /* 级联选择框选中项变化触发该函数 */
        async handleChange(){
            this.getParamsData()
        },
        /* Tab页签点击事件的处理函数 */
        handleTabClick(){
            console.log(this.activeName)
            this.getParamsData()
        },
        /* 获取参数的列表数据 */
        async getParamsData(){
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return
            }
            
            console.log(this.selectedCateKeys)
            /* 根据所选分类的Id和当前所处的面板获取对应的参数 */
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                params:{sel:this.activeName}
            })

            if(res.meta.status!==200)
                return this.$message.error('获取参数列表失败！')
            
            res.data.forEach(item=>{
                item.attr_vals= item.attr_vals ? item.attr_vals.split(/,| /) : []
                /* 控制文本框的显示与隐藏 */
                item.inputVisible=false
                /* 文本框中输入的值 */
                item.inputValue=''
            })
            console.log(res.data)
            if(this.activeName==='many'){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
        },
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        /* 点击按钮添加参数 */
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid)
                    return
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })

                if(res.meta.status!==201)
                    return this.$message.error('添加参数失败！')
                this.$message.success('添加参数成功！')
                this.addDialogVisible=false;
                this.getParamsData()
            })
        },
        /* 点击按钮展示修改的对话框 */
        async showEditDialog(attr_id){
            /* 查询当前参数的信息 */
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                params:{attr_sel:this.activeName}
            })

            if(res.meta.status!==200)
                return this.$message.error('获取参数信息失败！')
            this.editForm=res.data
            this.editDialogVisible=true
        },
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName})
                if(res.meta.status!==200)
                    return this.$message.error('修改参数失败！')
                this.$message.success('修改参数成功！')
                this.getParamsData()
                this.editDialogVisible=false;
            })
        },
        /* 根据Id的删除对应的参数项 */
        async removeParams(attr_id){
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err=>err)

            /* 用户取消了删除 */
            if(confirmResult!=='confirm')
                return this.$message.info('已取消删除！')
            
            const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

            if(res.meta.status!==200)
                return this.$message.error('删除参数失败！')
            
            this.$message.success('删除参数成功！')
            this.getParamsData()
        
        },
        /* 触发文本框 */
        async handleInputConfirm(row){
            /* 输入内容不合理 */
            if(row.inputValue.trim().length===0){
                row.inputValue=''
                row.inputVisible=false
                return
            }
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            this.saveAttrVals(row)
        },
        /* 将对attr_vals的操作保存到数据库 */
        async saveAttrVals(row){
            /* 发起请求保存数据到数据库 */
            const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })

            if(res.meta.status!==200)
                return this.$message.error('修改参数项失败！')

            this.$message.success('修改参数项成功！')
        },
        /* 点击按钮展示文本输入框 */
        showInput(row){
            row.inputVisible=true
            /* 让文本框自动获得焦点 */
            /* $nextTick方法的作用：当页面上元素被重新渲染就会执行相应代码 */
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        /* 删除对应的参数和选项 */
        handleClose(index,row){
            row.attr_vals.splice(index,1)
            this.saveAttrVals(row)
        }
    },
    computed:{
        /* 如果按钮需要被禁用，则返回true */
        isBtnDisabled(){
            if(this.selectedCateKeys.length!==3)
                return true
            return false
        },
        /* 当前选中的三级分类Id */
        cateId(){
            if(this.selectedCateKeys.length===3)
                return this.selectedCateKeys[2]
            return null
        },
        /* 动态计算标题的文本 */
        titleText(){
            if(this.activeName==='many')
                return '动态参数'
            return '静态属性'
        }
    }
}

</script>

<style scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
  width: 120px;  
}
</style>